+
+ (Note: there's at least one dubious thing in room.lisp: see the
+ comment in VALID-OBJ)
+
+345: backtrace on x86 undefined function
+ In sbcl-0.8.13 (and probably earlier versions), code of the form
+ (flet ((test () (#:undefined-fun 42)))
+ (funcall #'test))
+ yields the debugger with a poorly-functioning backtrace. Brian
+ Downing fixed most of the problems on non-x86 architectures, but on
+ the x86 the backtrace from this evaluation does not reveal anything
+ about the problem. (See tests in debug.impure.lisp)
+
+346: alpha backtrace
+ In sbcl-0.8.13, all backtraces from errors caused by internal errors
+ on the alpha seem to have a "bogus stack frame".